diff --git a/.github/workflows/development.yaml b/.github/workflows/development.yaml
index b4f2363c..d565f51a 100644
--- a/.github/workflows/development.yaml
+++ b/.github/workflows/development.yaml
@@ -108,7 +108,8 @@ jobs:
       - name: Run style tests
         run: |
           flake8 --ignore=E203,E722,W503 datajoint \
-                 --count --max-complexity=62 --max-line-length=127 --statistics
+                 --count --max-complexity=62 --max-line-length=127 --statistics \
+                 --per-file-ignores='datajoint/diagram.py:C901'
           black --required-version '24.2.0' --check -v datajoint tests tests_old
   codespell:
     name: Check for spelling errors